President Gustavo Petro said a U.S. strike in the Caribbean had killed a fisherman. President Trump said he would cut aid and impose new tariffs on Colombian imports. President Gustavo Petro of Colombia accused the United States of murdering an innocent fisherman in an attack on a boat that the American authorities claimed had been carrying illicit drugs, prompting President Trump to declare on Sunday that he would slash assistance to Colombia, one of Washington’s top aid recipients in Latin America, and impose new tariffs on the country’s goods. The feuding between the two leaders reflected rising tensions in the...